var praestaPos = 140;
var count = 1;

function scroll() {
    praestaPos = scrollTicker( "taglabticker", praestaPos );
}

function scrollTicker(id, pos) {

  var div = document.getElementById(id);

  if (pos < (div.offsetWidth * -1)) {
    pos = 480;
  } else {
    pos -= 1;
  }

  div.style.left = pos + "px";
 
  return pos;

}

window.setInterval( 'scroll()', 35 );